Decay

Most people hear ‘decay’ and think of a trip to the dentist—but in audio, it's not your teeth that suffer when things go wrong.

We spend a lot of time focusing on attack—the leading edge of sound. It’s where the energy lives, where instruments come alive, where dynamics hit. But what follows matters just as much. The decay of a note—how it fades, trails off, and interacts with space—is where realism lives.

And it’s where many systems fall short.

Decay tells us everything about the recording environment. The lingering shimmer of a cymbal, the natural reverberation of a concert hall, the slow fade of a bowed string—these are cues our brain uses to build a spatial map. When decay is accurate and uncolored, the space opens up. When it’s smeared or cut short, the illusion breaks.

The problem is described by our old friend, physics.

When you put energy into a driver—especially a cone or dome with mass—it keeps moving, even after the signal stops. Like stepping on the gas in a car, there’s momentum. And when you lift your foot, the car doesn’t stop immediately. It overshoots. So does the driver. That energy has to go somewhere. And unless it’s perfectly damped and controlled, it shows up as overhang—unwanted motion that smears the decay and muddies detail.

This is one of the hardest challenges in loudspeaker design. Midrange and tweeter drivers in particular need to stop on a dime. That’s why in our Aspen series speakers, we use ultra-low-mass planar magnetic drivers for the mids and highs—lighter than the air they’re moving. With less moving mass, they don’t carry momentum.

They stop when the music stops. The result is clean, fast decay that lets ambience and spatial cues remain intact.

In the low frequencies, the challenge is different. Woofers deal with far more energy and much longer wavelengths. Here, overshoot and distortion are the enemy. We engineered our woofers for low distortion and tight control, with motor structures designed to stop excess motion before it starts. Because bass decay matters too—a bloated or boomy low end can mask everything above it.

Good decay behavior is easy to hear once you know what to listen for. Play a solo piano recording and pay attention to the tail of each note. Do the harmonics linger naturally, or do they collapse too quickly? Listen to a quiet jazz ensemble. Can you hear the air around the instruments, or does it vanish into a flat backdrop?

When decay is clean and unforced, music breathes. The space feels real. And the performance stays alive, even in the silence between notes.

That’s the difference between hearing sound—and hearing truth.